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Yes, that's what I thought also. Since my AC and Heat are working fine and the fan is working properly for both, just how could a wire be switched? I would think that one part of the system wouldn't work at all if that were the case.

Yes, I have a humidifier connected to the furnace, but it works fine. When I turn off the humidistat, the humidifier never goes on. I believe the furnace only provides a power transformer for the humidifier. The actual switch is in my dining room next to the thermostat.

Perhaps I should unwrap the electrical tape for the wires that are above the furnace and see if some bare wires are inadvertently touching.

If that were the case then why wouldn't the voltage "back feed" through the stat even if it were wired properly and still bring on the condenser? The thermostat doesn't know or care which color wire is connected to which terminal and to what piece of equipment it goes to. I'm not following your logic on this one, please explain further.

How does the thermostat turn on the fan on a call for cooling? If you think about this, you will get to the point I am making. Think about the relationship of the Heat-off-Cool switch and the fan. You will get there. Willis?

How does the thermostat turn on the fan on a call for cooling? If you think about this, you will get to the point I am making. Think about the relationship of the Heat-off-Cool switch and the fan. You will get there. Willis?

What'cha talkin' 'bout Willis? Is a line from an old TV show - Different Strokes.

Some furnaces have a "Y" terminal that activates the cooling speed regardless of if the "G" is energized. My Carrier works this way, YMMV. If the "Y" and "G" were reversed at the stat it would work normally until you turn the fan to "On", then it would run the A/C.

Yes, that's what I thought also. Since my AC and Heat are working fine and the fan is working properly for both, just how could a wire be switched? I would think that one part of the system wouldn't work at all if that were the case.

Yes, I have a humidifier connected to the furnace, but it works fine. When I turn off the humidistat, the humidifier never goes on. I believe the furnace only provides a power transformer for the humidifier. The actual switch is in my dining room next to the thermostat.

Perhaps I should unwrap the electrical tape for the wires that are above the furnace and see if some bare wires are inadvertently touching.